Improvement in padlocks



ADDISON CROSBY, OF VVESTFIELDNEW YORK.

Letters Patent No. 91,610, dated June 22, 1869.

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The Schedule referredto in these Letters Patent and making part of thesame.

To all whom 'it may concern:

Be it known that I, ADDISON CROSBY, of Westfield, in the county ofChautauqua, and State of New York, have invented a new and usefulImprovement in Locks; and I do hereby declare that the following is afull, clear, and exact description thereof, which will enable othersskilled in the art to make and use the same, reference -being had to theaccompanying drawings, forming part of this specification, in which-Figure 'l is a vertical section of my invention, taken in the line x x,iig. 3 c

Figure 2 is a vertical section of the same, taken in the lineyy, fig. 3.

Figure 3 is a horizontal section of the same,'taken in the line z z,fig. l.'

Figure 4 is a detached perspective view of the key. Similar' letters ofreference indicate like parts.

This invention is designed as an improvement upon the ordinary padlock,whereby simplicity is obtained, with security, or difficulty in pickingor illegitimately opening the lock, while the interior of the same isprotected from moisture, and prevented from being choked or clogged upwith sleet or ice during the winter-season. Y

In the accompanying sheet of drawingsp A represents the case of thelock, and

B is, the bow, or shackle, which works up and down, said bow or shacklehaving a straightrportion, a, which works within the case, as shown ings.l and 2, a spiral spring, bwithin the case, throwing the shackleupward wheneverit is released from dogs,

which retain or hold'. it down in a locked position or` state.

C C are the Vdogs which are' fitted loosely on an arbor, D,within thecase.

Said dogs have springs o attached,'which springs have a tendency to keepthey lower ends of the dogs in a notch in the straight portion of thebow or shackle, in order to hold the same in a locked state. (See moreparticularly fig. 2.)

E represents the tumblers, four being shown in the drawings, two at eachside of the dogs.

These tumblers are suspended by pivots ax, and have oblong curved slotsdmade in them, through which the arbor D passes.

The lower edges of the tumblers are notched, orv

serrated, and each has an upright slot, e, made in it, said slot beingat diierent points inthe several` tume blers.

The dogs O Ov have each an arm, F, pivoted to th in, and these armsextend. down at the outer sides oi'i he tumblers, and have each a smallbar, dx, projecting from them at right angles, said bars extendingunderneath the tumblers. v

" I claim as' new, and

The lower parts of the arms F work between guidepins eX eX, which keepthem in place. (See fig. 2.)

From the abovel description it will be seen, that in order to unlock thelock, the lowerends of the dogs C C must be thrown out of the notch inthe upright straight part a of the bolt or shackle, and, in doing this,the arms-F will necessarily be raised, and conse.

openings in the bottom of the lock-case, and the bitsV g g irst adjustthe tumblers E E, so as to bring the .slots e in the several tumblers inline with each other,

and the ends of the prongs ff then come in contact with the upper endsof' the dogs O C, and throw the lower ends of the latter ont from thenotch in the straight part a oi' the bow or shackle B, and the spring bthen throws the latter upward.

The tumblers are provided with springs h, to give A,them their returnmovement, as the prongs ofthe key are withdrawn.

VIt will be perceived that the lower edges of the Ytumblers E havea widemovement, or sweep, compared with the movement or sweep at the pointsbx, where the bits g of the key act against them, and hence it willbeseen that it would be a very ditlicnlt matter, if not utterlyimpossible, to adjust the slots @of the tumblers `in line'with eachother by any illegitimate means, foi-*the 'slightest movement of thetumbler at V`b ,`will cause the lower edges, where the slots e-are made,to move a considerable distance.

I t willfurther be seen that the lower parts of the tuniblers'are insuch a position that they cannot be reached and-acted upon by picks, andtampered with. desire to secure by Letters Patent'- l 4 V1. The risingand falling bow or shackle B, in con` nection wit-h'the dogs C,thertuinblers E, provided `withthe slots e, andthe arms F, having thebars ZX attached, all-arranged to' `operate in the manner subst-antiallyasiand for the purpose set forth.

, 2. lhe key G, provided with two prongs f j, having .lateral bits g g,when used in connection with the tumblers E and dogs C, all arrangedl tooperate substantially as and for the purpose set forth..

Witnesses: ADDISON CRO SBY.;

FRANK BLocKLnY, E. GREENE COLLINS.' I

